When We use two shortcuts one after the other(just like in typing) in this case W-world map, R- Tech tree, we will get strange overlaping of tech tree window onto our city map. Its occuring in 2 different ways, only as a frame of tech tree, or whole tech tree on city window... We can colect coins f.e. when we pressing on techs .. nice fun, You should try
In the chain reacion of this issue in some cases ( i made like 30 attepts) after we get frame of tech tree and then try to visin tech tree again game freezing, same when We get whole tech tree on city view and then We will try to visit world map.

Method 2: (i called it inception) We presin g W+R in same time (it causing same issue, but loading window is some kind of inception-screen 2)

Expect:

We should be able to use only 1 shortcut at time.

Repro steps:

1) loing to game
2) type WR
3) Noticed tech tree loading with strange blinking on bottom bar
4) Back to city
5)Notice frame of tech tree in Your city ( It looks Realy cool BTW)